COMPONENTS OF THE COMPANY'S CONSOLIDATED BALANCE SHEETS (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (2,163)	$ (3,130)	$ (1,689)
Other comprehensive income (loss) before reclassifications	(1,741)	760	(1,508)
Amounts reclassified from accumulated other comprehensive loss	167	207	67
Other comprehensive income (loss)	(1,574)	967	(1,441)
Ending balance	(3,737)	(2,163)	(3,130)
Unrealized Gains and Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	890	583	(266)
Other comprehensive income (loss) before reclassifications	(2,055)	307	849
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Other comprehensive income (loss)	(2,055)	307	849
Ending balance	(1,165)	890	583
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,641)	(2,484)	(712)
Other comprehensive income (loss) before reclassifications	800	636	(1,839)
Amounts reclassified from accumulated other comprehensive loss	167	207	67
Other comprehensive income (loss)	967	843	(1,772)
Ending balance	(674)	(1,641)	(2,484)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,412)	(1,229)	(711)
Other comprehensive income (loss) before reclassifications	(486)	(183)	(518)
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Other comprehensive income (loss)	(486)	(183)	(518)
Ending balance	$ (1,898)	$ (1,412)	$ (1,229)